Aswimmer is drowning at b, a distance a/2=10 away from the beach. a lifeguard patrolling along the very edge of the beach spots the swimmer at point a which is a distance a=20m away from the point on the beach that is closest to the drowning swimmer. the average speed of a lifeguard running along the beach is v = 8 metres per second and her average swimming speed is v=v/3

the lifeguard runs along the beach at point c before she starts swimming find the quickest time t in which the life guard can reach the drowning swimmer.

Which shows the correct substitution of the values a,b and c from the equation 1=-2x+3x^2+1

How do the number line graphs of the solutions sets of -23 > x and x-23 differ?

Data from 2005 for various age groups show that for each $100 increase in the median weekly income for whites, the median weekly income of blacks increases by $105. also, for workers of ages 25 to 54 the median weekly income for whites was $676 and for blacks was $527. (a) let w represent the median weekly income for whites and b the median weekly income for blacks, and write the equation of the line that gives b as a linear function of w. b = (b) when the median weekly income for whites is $760, what does the equation in (a) predict for the median weekly income for blacks?